6-max tough pre-flop decision

[SumZero]

$30+3 6-seated tournament. 73 of 152 remaining, average chip stack ~3100, 30-60 blinds.
Hand #32921293-75 at Mon1amA-005 (No Limit tournament Hold'em)
Started at 26/Jun/06 01:59:47

UTG is at seat 0 with 1620.
MP is at seat 1 with 990.
CO is at seat 2 with 2200.
Hero is at seat 3 with 1420.
SB is at seat 4 with 4150.
BB is at seat 5 with 1895.

Hero: A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img]

Pre-flop:

1 fold. MP raises to 120. 1 folds.
Hero calls. SB re-raises to 1930.
1 folds. MP goes all-in for 990.
Hero should?

SB has been aggressive to date but not unreasonable with his showdowns. MP has been loose-weak. I called the original minraise hoping to end up all in on the flop versus MP's c-bet, afraid that MP would fold to the PF raise. But SB's push and the call puts me in a trickier position.